Technical facts

Operating system(s) or programming environment(s)

Lubuntu 15.04 (vivid)

IDE(s):

Qt Creator 3.1.1

Project type:

Console application

C++ standard:

C++98

Compiler(s):

G++ 4.9.2

Libraries used:

STL: GNU ISO C++ Library, version 4.9.2

Qt project file: ./CppBoostWeak_ptrExample2/CppBoostWeak_ptrExample2.pro


include(../../ConsoleApplication.pri) #Or use the code below

# QT += core

# QT += gui

# greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

# CONFIG   += console

# CONFIG   -= app_bundle

# TEMPLATE = app

# CONFIG(release, debug|release) {

#   DEFINES += NDEBUG NTRACE_BILDERBIKKEL

# }

# QMAKE_CXXFLAGS += -std=c++11 -Wall -Wextra -Weffc++

# unix {

#   QMAKE_CXXFLAGS += -Werror

# }



include(../../Libraries/Boost.pri) #Or use the code below

# win32 {

#   INCLUDEPATH += \

#     ../../Libraries/boost_1_54_0

# }



SOURCES += main.cpp

./CppBoostWeak_ptrExample2/main.cpp


#include <iostream>

#include <vector>

#pragma GCC diagnostic push

#pragma GCC diagnostic ignored "-Weffc++"

#pragma GCC diagnostic ignored "-Wunused-local-typedefs"

#include <boost/shared_ptr.hpp>

#include <boost/checked_delete.hpp>

#include <boost/weak_ptr.hpp>

#pragma GCC diagnostic pop



int main()

{

  {

    //nullptr do not add to use_count

    const boost::weak_ptr<int> a;

    assert(a.expired());

    assert(a.use_count() == 0);

    const boost::weak_ptr<int> b(a);

    assert(b.expired());

    assert(b.use_count() == 0);

  }

  {

    //using multiple weak_ptrs does not increase use_count

    const boost::shared_ptr<int> p(new int);

    const boost::weak_ptr<int> a(p);

    assert(!a.expired());

    assert(a.use_count() == 1);

    const boost::weak_ptr<int> b(p);

    assert(!b.expired());

    assert(b.use_count() == 1);



  }

}

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(C++) BoostWeak_ptrExample2

Technical facts

Qt project file: ./CppBoostWeak_ptrExample2/CppBoostWeak_ptrExample2.pro

./CppBoostWeak_ptrExample2/main.cpp